Regarding the FTP protocol, which of the descriptions below is correct?

Question

EDDIE LIN · Accepted Answer

In FTP Passive mode, the client completes the initialization of the TCP session for control and data

EDDIE LIN · Answer

In FTP Active mode, the server tells the client which port it expects to send data on by commanding "PORT"

EDDIE LIN · Answer

FTP always uses a TCP session to transmit control information and data information

EDDIE LIN · Answer

FTP always uses TCP port 20 to establish a data session, and ICP port 21 to establish control will always use E. FTP TCP port 21 to establish a data session, TCP port 20 to establish a control session

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